861238738 has 8 divisors (see below), whose sum is σ = 1292669820. Its totient is φ = 430348800.

The previous prime is 861238709. The next prime is 861238747. The reversal of 861238738 is 837832168.

It can be written as a sum of positive squares in 2 ways, for example, as 851297329 + 9941409 = 29177^2 + 3153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131283 + ... + 137686.

Almost surely, 2^861238738 is an apocalyptic number.

861238738 is a deficient number, since it is larger than the sum of its proper divisors (431431082).

861238738 is a wasteful number, since it uses less digits than its factorization.

861238738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270572.

The product of its digits is 387072, while the sum is 46.

The square root of 861238738 is about 29346.8693049191. The cubic root of 861238738 is about 951.4249117424.

The spelling of 861238738 in words is "eight hundred sixty-one million, two hundred thirty-eight thousand, seven hundred thirty-eight".